SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c7b86965a36fcfd369664a775f2eddfa258e8c3d2617b4f02f06e83e246f99' 
  AND token = '7BlqCzVr2LZfWFoihTgR2Nc/H3Z9YqznJ1PzRpBVtnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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