SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed556f350f6d56a632c1d95106802c5071e2aa7a364db2c3a868f602263be67c' 
  AND token = 'Z2TyKZsvx2pADgCxwu6lwaonfpb5i/1M4ZQL4ItaLvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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