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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46a65f1a66ff3aa27c5e609224ed1d4df4bd4280b6e838073b402ee569f767e' 
  AND token = '/w4smT7/jV7UDQFnQeHrkjX1TVpbqOel2Yo9zRW122k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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