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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c7ab41e1775ba047b54a1cd3ba41b03175ef7fd471f0af4f75016d02d9c9fc' 
  AND token = 'lMKVDSGuqY1eyN3zQitcIn8/4TgI20ptpwJHNLuEVcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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