SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2882f22e7c80cc0f4d4fdf58f392f570f6a4cde04cacafa13b0bd070649d75bd' 
  AND token = 'DCOnpY0zVX7L+k1uKKPwmWzOpheogWaDQp9C/Zv5Aw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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