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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4408e00fbf4b895b0d2af3612593b7a9fc662b9f9a295887618004e441181240' 
  AND token = '9vVd/C9iROpK6dtkcXMOnleYYTodojcWPzqKhW2d6g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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