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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b71e7c86d15cf8fab85c4d6f10598e465c212d33dee234fcf934ba24191648' 
  AND token = '8sPnfPhSiSnfHqoqm+2DeuCfzP+U7F9wNyOSn6uRZMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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