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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1bd1d32912ef44f1fb5445eee221f5609cd0d4280cc3b34781e980e8d2bace' 
  AND token = 'gG9M5RrfW7fyDRfLI8tcK0mSn9m5wdNLa6q4P9go0pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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