SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c14a3024b98e6cd942ffd6e455d23b7a12bd0fc649d6cf722f0f2f927dcc650' 
  AND token = '5iCwRVThGQnIPm58IUYRoSlfQ91UMKeYv9/Q8ZpnDxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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