SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4580191fa9b846bf3b46b4e04786b4bffb197c7a32bc22f8d68996513a8030e' 
  AND token = '5E/ylDCSdZOBhgGQZRtbyYQdfVi+JT38f7W93sqLCVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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