SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010759fde3d914b861d3cf2346e4cbbb383f3d0a4fe7a1147d1a70b09e5b58f4' 
  AND token = 'wT4AhgdF0JKBGZPWmuMUHBcHPj6rGLqrJymoJDickCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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