SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd6f6ce18dfc597d6c53849021d824d2aca58faf9b779702f5067c2e8da9de8' 
  AND token = 'UvvOhMZ6V4jTqEGtumtPt3KcnNQzQu/oSYBA8y2FQkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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