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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1f889ab9f18776faacff2241b79e1bd73f37d98037be0cef4cf4a4902e7754' 
  AND token = 'LuT2CpABjr1MYOTLgQaBq0En7Ewxesr2dunQdhYnu9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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