SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b2f9714a36e20a36368d6538fc2913592a2a3808c6f4968323a16771529bfb' 
  AND token = 'Gfc4xwP12QkhPS0z/D0FRF5J0lVEwrKWmlHZnu5B6s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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