Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1089696862a8cc7e4a425632686de46dc2a4f0814baee487da39b3e4c5ffcf' 
  AND token = 'nFWEQPF+r5U5SzRCUjjTqnP0cbF/XAaGNzVs9lmV2dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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