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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d8f212708c821c6330d79fe24f8865a1e3ce6cef10f9a121f44b41580ee344' 
  AND token = 'FIInkPGKDmwbAt5yp8vPnyQF/WJSXS8mAcvHbSZSXOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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