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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b66e971084fec6f78924174ef0c970e839e4a288db1d1c52240604d5c5bbdb' 
  AND token = '4V60QukM+G+F8DWuaIWmPn/XFIUUdakIDbWkjvuspGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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