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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492384e6b7aa28a0ff016ea2c860b6480c7d283cafb357a5a85e1eeea4187eda' 
  AND token = 'wC2fbrWZmQvbI8BVwBuJ5zta8qtEE0Xvqz6YPINHMCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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