SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5d912bdab37f645f318271f58cfc0632254dc3564d5e35c831bbc45fd67412' 
  AND token = 'laTlzwMLKXtWIHdI7vy3kNRiizi9Xs2Ph+JlBxjO4Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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