SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ed2a64f026c31ad0d66ef754c0017e8a986bb98878d38b503b23eb9b78a6ee' 
  AND token = 'BzZ14ja5VbvQ2fOq8BgIUlkopKIPVV6iZhrNQqjPUAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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