SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9e767621d23c0b1a4a4d2842f5ffc57d9ee29a5ea9825d59a9652ccedd175d' 
  AND token = 'JDT5vOEVZffGHIEBHNlY3U9j6VGStUpeKbfv/W1CwJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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