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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03918e0ecedcc0369e94d6d9498854a13d5fb7087dfe480439d11c84e6e34d9' 
  AND token = '6EqV7iSrI4qphUupo1QgtjNVXY+jTVvoBgtFM7hVW18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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