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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8e3b462d3a17689b3f5e986e352e5eac83389e61f57e4f77d5a356411cee4f' 
  AND token = '7tid6w2tSuIhIYGvWOo5tw9d71PxUbclzzU+E1W5zU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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