SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458c9232c2a9578ab745cccac38ed904ec986726d49fb87a5e941863df475b7f' 
  AND token = 'aqY75GJqUPX0Ej0ZsGrvj1O3hKb64mNgxpsFgUrQZ2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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