Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d0cb91a0db74a5490b21770553bf0c96ebe7d3db4d57116c4f77719f5e11c0' 
  AND token = 'foIMMxI8JaHAHeeCuEhBLbUNtsog0QxNuPZRULk8dh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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