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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283e13e07c5e4dae5532b1ce23411cbad5beb0045c97ff43a0f7a3cbaf33c892' 
  AND token = 'dYcxTn8sQGDOnyW/cXKcV2WkkCJBJI7Pm+7TXHrxloU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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