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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cebbe212b36d53b78a60cb8826105c93d2890fedb771920ea8ad17a253f3a7' 
  AND token = 'l5HsRAYJawpKP1jqe7TGfdvruNd3X5miQI6qqWqk4tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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