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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6dfc3f308c595b0d7fa33510db3df6ece8f267e2975fa9864adfaed224ae27c' 
  AND token = 'i74TNZch3m84ajKATypbtkZTuC1iv3H7+clrdYuE5G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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