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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ccc729717d1b5b02da82c9714fc948a810e65d78c8c61fadb59c45de59d166' 
  AND token = 'h6IujCYgnRe9PNU2M9IHFrYc0DG7rhx6nSNadlXlNjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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