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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cfcbd0084e927a24e5543079fc579d049efb31568636db9f5c7aacc64e9d3f' 
  AND token = 'c0K50mKrNB+qOP4qo07CxzBZAhk0k5sDVclbP5tg9VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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