SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6960b26b45557cb4442ed40179e38d64fc5096a7da1ff247aaf8cf37dbe9660' 
  AND token = 'nUG7lwvHfgafmjfKhqe7N8lu/PgNBCxzGo/ZC7yV624=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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