SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb1d1f1810157d95076506066078642f8c723ed530cf73abbf77b7ed1fc6012' 
  AND token = '2oBZACipiDhFOkiKeL/sYqgunZupCq4chZdHQw/o9Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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