SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4947803dfc86c1d742c7a059c4b276341184f54bd3be59a27fb9cf20727780e' 
  AND token = 'GkE8SWtHBxV1RBnGCYy0uFpvw0j5JTq7m4HXxc5+zi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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