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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b392a144880ab61a3aa9f6e04edda7b79937548550b6814b871768773e7e1867' 
  AND token = 'U4hmnOxSCN/sS85e3GLy/UdWkQLwYsGw1H6Nm7A3B9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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