SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f639227fd9ec95dc1315a9e1c824a36617e76d994b592477e3233a4cac9404' 
  AND token = 'ivuBAWfaQxrs3Dh8l9CJN67L5zKTKUFXUqLfwBvloVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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