SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfb5d6f00ec9c6988febe957e9b057bc9a24a4598d87f2c3324188e640c220d' 
  AND token = 'evbUp1ZVZSF5vJHxCpjvC0p2YCPFEwN/iK3NZmNuuWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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