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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8b68ca5ea0b767027f847c1afe7a7c3e87eddfba39bab056f9d91850438084' 
  AND token = 'HGWuyVPq1YUGB6cUUwc7Cii6WocKFmHeajqc+JKRBWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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