SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62d0df8d4547b4ce58868dbe3f0294409f44f6dab509f42537aa6f9c657018c' 
  AND token = 'KVsO28vD9zDp/1vJKCCXA7/tAg/KygqOojp7fZp0XoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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