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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4830fb6073844526488b334408134e7c4662bd64e94e5cbd6b08f0e34ec3b734' 
  AND token = '2phlmo3O1ac34LGRjkgEZDNO0zNz3gshm/1QhMOjRss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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