SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c77fce7ac301631a84e4385e2ac62901ed78e05bb445e4a15fd18ab3fa4c69' 
  AND token = 'l/XvhS+YCMC2kYTQQo0aMxbmhPjLt8pYnhwO/xKSiZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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