SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6da8cf28d6ad797554869f5b2fda73245741f88b8384db1959758c52ec0eb0' 
  AND token = 'zqDsoq66J+78CSttcVgCzYn3Rrv60OaZBqd/+VgNOxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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