SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd7409c3552f0b502a393b3dccf7a5ed21e839f123634b7182bfa6cd70343f5' 
  AND token = 'W/CqbtvmtjmHEasZUOrz7BkkXBwuYt2C8buAlE+1zT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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