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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d15de53fe5c96095ac15f1996bf377d881444c639890ea6aa946d020f772754' 
  AND token = 'c64wgZhWD4v4iA2iwfq89vT6wdfTLxH8ykYyzkIjIPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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