SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3bea146ccc0e8d346ac41630a86f65de367b553e80f4dbc11d74354ef2ed2d' 
  AND token = '/fjdsD7D6zMDB0pD+quyrSrZvC3tnpAVGPIHqTwpg9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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