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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdc44a77921bf12b99b47c03934c8496233cb249230dc1f7a025f9ba0f27b44' 
  AND token = 'rg6Z94vcuqVzQvwEEMv8JsN5Yibc9nMUlrPs1X7ehhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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