SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '378c591b973f73bfe79faba94229427fd6385581a1c24dd44c1243bd592ee0fd' 
  AND token = 'IjCF1xgadZEANymnH65+qZN4SKoXvPH9+ei+qiveGjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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