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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615daea0e190907e03c54fc55a216a4220e5f7bf7212ebdf78e146ea26c2c521' 
  AND token = '61A7Twrpl+izj7JLy0HcY0AjGX0uygv5RuNwyTvRpDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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