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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04dacc18b38419a7491d28f45f4e3fc527cd9db0ed9f33506e7cd09bf3ac1a74' 
  AND token = 'g2/Fve0HcIU6JVaGOnSs2bDmoFMI0d1RNjuWrbtR8Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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