SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca299b682c7a1ee7cf3ef14140dc0e5b84d99b5ebc78419177fa7f82fa6530e2' 
  AND token = 'DCjy8Dzi0ilcsh/tR82PQaH+j49Jpm0VgoYCqqgKmMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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