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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24ac9a9657eb472b7bc7e648e4b6633faf6b4dfdefb224cd1af9859f3880a99' 
  AND token = 'kFXnxL6NLv1DgVf7sAwIJzdgQObb1QbZOdtIYksARUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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