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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37de54451355e05ae15863d5cac7ef421ab1d011e2f1b182a8f1f5aca55b0a4' 
  AND token = 'mg882wUID4TujGidVvPk1WX1othn7aunuQYyE7u6ph8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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