SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4119d03dfdd26cf2e3fb36de4c957b7cf7742aed1b8d7a6c02bbcea984e11c0e' 
  AND token = 'Ps1vufWFd+V+/o/2hRVgD8JfiKDRxq+wgGIdadvENL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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