Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e669b8258c06529b9c0523c29c70265a181255c89e8ca6bda5fedf9a1f1027' 
  AND token = 'Qd/7byBLlEXL3J6urjX4WYF+KFopX0EfThZXYaSSijw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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