SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048a070839ebd1f7badef31887c3a41048f97cab1f69c63f19bbe9dba6626538' 
  AND token = 'ZgnMVArtXFJeULKCJl8GEqC5fJ7mzY8k0SJmvua95WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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