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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed89ffcf74df02b6debb2cf3e3451b6d87b1be8e6e55f2ef2a2e4a0adc75613' 
  AND token = 'xlWK0JI43joOq7vEfD/n187lJSvS0uSLzsMcSEC3DUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}