SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2080d219b947db81b63f8f2c1c077a61f9a73d9c4e7257c58bbdcf429cf3fc' 
  AND token = 'nYhtaYNn2GiauQmVihUlPF/YJZmh6W47PVGUnXUwanA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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