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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f434caac6b83918492b360426390d200a71395166580e651fea3e4aec5cfda4' 
  AND token = 'J/ENeBKVX6cUY3kpLyW99PRfN1nE4cKPR+l6KEWHDdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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