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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3b664473993d0c4334b9fdf0e46ba35abab65a28d366cf810338961bfbce06' 
  AND token = '6VrOaaqZ9C5pHmPC1713jGasPMyoRH+cJYhAYD0SZo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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