SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d81fecc34524568e9992025ffd7fd6d3b35bd0ffb0bc0b66949c0cfd19c54e' 
  AND token = '5T2d+FviBij9lA+L6oxpy74MJC//wKL/2ZRPuyTKWSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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