SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfbb4bdceb6ead3b32384855c80b50437510782f58b025a7bac19ba63fee42a' 
  AND token = '7VsJ6MUY9oTfKm7XEuPhshgnsK9u9wl8lVPqm/jssBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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