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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70102d4f7f68182d0f0308aefc15a4b6216b1d5b49e817260a7ed5e569c311c0' 
  AND token = 'whzc+xBg0X8wkTlwBHElIwniZY2gLQmXZmLqXD0TQRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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