SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bddcea34f8cab3f71bd2c909ceae65821649959b1f9a2012d9db049253e7ab' 
  AND token = 'jNq7J0p/vIrwjCK+hYx6AZeC1O/7g+hMmQEX9HvqYww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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