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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8843ca729555359fc84040696a661edacf03e2b363fbb6cd533f1ab4b267eef' 
  AND token = '3+XpP+C2NorT33/Q5NffmaFM4g3AYHiXNfuxU3zIy1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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