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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0dae1bcdd9739e3f5a1b089e598a8ed32d2e9b75d911638dcf90a851954793' 
  AND token = 'KY6qae0FAZzwcUoJP1Y2BHvkyJ5uooNZbjxeGIJhN2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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