SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c846d432d84fc4d690219ff8b8fdd0d55564f95af8f8270aa72c46762fcb80e' 
  AND token = 'XCbuDwo/p0oM2EqWAYZ0kHDmsoEJp034KvrM3LiGRJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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