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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b265c090756443bde80688d6a9fe947dcce6a4d5bae2c700357cc0e05dfe197a' 
  AND token = 'W3sm3PPw0cr/BkuSr6Ipkdq24AnDLjlOp4VLEHo4cYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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