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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9e4d6a778f4e5be4e564717daff863e0ea79657d026c3e48238d2f65a19092' 
  AND token = 'H6FHea05dM7iGgb9LvWESKlEpVHFyOIwHzMAWxLbNFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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