SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328a85151d26af645394a251d5ce59a6377bc74676d7cd366d286dd2df1d5304' 
  AND token = 'sRj2/rSaCZqg9diT/jv6WhZBSb71n+zNyCGHUGx7oZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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