SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd024e022711b3d66da5c1886c79d6854c142ab4551a3ef58a1276e0c3e4cd3e' 
  AND token = 'OhyzH2uFqkUu/oX95hb/F9WPYEVgihvKAkYHC5L5Eds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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